Process Control and Instrumentation
Which of the following does not figure in the list of seven substances selected for international temperature scale?

Oxygen and sulphur (B.P)
Ice (F.P) and steam (B.P)
Antimony and silver (F.P)
Zinc (B.P) and mercury (F.P)

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Process Control and Instrumentation
Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

Using steel tube in place of glass tube
Filling nitrogen under pressure in the stem
Accounting for the tube expansion
Increasing the diameter of the tube

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